Weight loss peptides like semaglutide and tirzepatide are prescription medications, which means you can only legally buy them through a licensed pharmacy with a prescription from a healthcare provider. There is no legitimate way to purchase these drugs over the counter or from a website that doesn’t require a prescription. Understanding where to go, what to expect, and what to avoid will save you money and protect your health.
What These Peptides Actually Do
The peptides used for weight loss mimic a gut hormone called GLP-1, which your body naturally releases after eating. This hormone signals your brain to feel full and slows digestion, so you eat less without feeling like you’re fighting constant hunger. The effect is primarily about reducing how much food you want to eat rather than speeding up your metabolism.
GLP-1 receptors sit in several parts of the brain that control appetite, including areas in the hypothalamus and brainstem. When a medication activates those receptors, it triggers the same “I’ve had enough” signal that food would, but stronger and longer-lasting. Some newer medications, like tirzepatide (sold as Zepbound), activate a second hormone receptor called GIP alongside GLP-1, which appears to amplify the effect.
FDA-Approved Options You Can Get Prescribed
Three brand-name medications are currently FDA-approved specifically for chronic weight management:
- Wegovy (semaglutide): approved for adults with a BMI of 30 or higher, or 27 or higher with at least one weight-related condition like high blood pressure or high cholesterol.
- Zepbound (tirzepatide): approved under the same BMI criteria as Wegovy. It works on two hormone pathways instead of one.
- Saxenda (liraglutide): an older daily injection, generally producing less weight loss than the other two.
You may also see the names Ozempic and Mounjaro. These contain the same active ingredients as Wegovy and Zepbound, respectively, but are only FDA-approved for type 2 diabetes. Doctors sometimes prescribe them off-label for weight loss, though insurance coverage becomes more complicated when they’re used that way.
Where to Get a Prescription
Your primary care doctor, endocrinologist, or an obesity medicine specialist can write a prescription. If you’d rather not visit a clinic in person, several telehealth platforms now offer consultations specifically for weight management. Eli Lilly, the manufacturer of Zepbound, lists vetted telehealth partners on its website, including Form Health, 9amHealth, and Knownwell. Each pairs you with providers who hold board certification in obesity medicine and often includes registered dietitians as part of the care team.
Other well-known telehealth companies like Ro, Calibrate, and Found also offer weight loss programs that can include GLP-1 prescriptions. When choosing a platform, look for ones that require a real medical evaluation (not just a questionnaire), connect you with a licensed prescriber, and send your prescription to a licensed pharmacy. Any service that lets you skip the medical evaluation entirely is cutting corners you don’t want cut.
What It Costs and Whether Insurance Helps
Without insurance, brand-name GLP-1 medications typically run $800 to $1,300 per month. Insurance coverage varies widely and often comes with frustrating restrictions. Many insurers will not cover these medications unless you have an obesity-related medical condition like high cholesterol, high blood pressure, or sleep apnea. A high BMI alone may not be enough. And if your doctor prescribes Ozempic or Mounjaro off-label for weight loss instead of diabetes, insurance usually won’t cover it at all without a type 2 diabetes diagnosis.
Manufacturer savings programs and copay cards can reduce costs significantly for people with commercial insurance, so check the drug maker’s website before assuming you can’t afford it. Some telehealth platforms also negotiate lower cash-pay pricing, though these deals change frequently.
Compounding Pharmacies: A Gray Area
During periods when brand-name GLP-1 medications are in shortage, federal law allows licensed compounding pharmacies to produce versions of those drugs. This is how many people have accessed lower-cost semaglutide and tirzepatide in recent years. However, the FDA has signaled it intends to restrict compounded GLP-1 products as the national supply stabilizes, and companies like Hims & Hers have been specifically named in those announcements.
If you go the compounding route, you still need a valid prescription from a licensed provider. The pharmacy must be state-licensed and ideally accredited by the Pharmacy Compounding Accreditation Board (PCAB). The FDA’s position is clear: compounded drugs should only be used when an FDA-approved version can’t meet your medical needs. Certain newer peptides, including retatrutide and cagrilintide, cannot legally be compounded at all under federal law.
What to Avoid Completely
Dozens of websites sell vials labeled “semaglutide,” “tirzepatide,” or “retatrutide” marked as “for research use only” or “not for human consumption.” These products are illegal to sell for human use, and the FDA has been issuing warning letters and taking enforcement action against these sellers. In December 2024, the FDA warned Summit Research Peptides for selling semaglutide, tirzepatide, retatrutide, cagrilintide, and mazdutide as research chemicals while clearly marketing them for human injection, complete with dosing instructions.
These products are not tested for safety, purity, or sterility. You have no way of knowing what’s actually in the vial, how concentrated it is, or whether it contains contaminants. The FDA considers them unapproved new drugs and has stated they “may be harmful to your health.”
Here are the clearest warning signs of an unsafe seller:
- No prescription required. Any site selling injectable peptides without requiring a prescription is operating outside the law.
- Labeled “research use only.” This label is used specifically to skirt FDA regulations. If the site also provides dosing instructions or markets weight loss benefits, it’s illegal.
- Prices far below market rate. Brand-name GLP-1 medications are expensive to manufacture. A vial selling for $50 to $100 is not the same product.
- No licensed pharmacist on staff. Legitimate pharmacies list their license numbers and have a pharmacist available for questions.
- Sold through social media or unverified marketplaces. These channels have almost no accountability or quality control.
The Practical Path Forward
If you’re ready to explore peptide-based weight loss, the most straightforward route is to schedule an appointment with your doctor or sign up for a telehealth weight management platform. During that visit, your provider will assess your BMI, medical history, and any weight-related conditions to determine whether you’re a candidate. If you are, they’ll write a prescription that you fill at a licensed pharmacy, either a retail chain or a mail-order pharmacy affiliated with the telehealth service.
Before your appointment, check your insurance plan’s formulary online or call your insurer to ask whether Wegovy or Zepbound is covered and what prior authorization steps are required. Having this information upfront can save weeks of back-and-forth. If your insurance won’t cover the medication, ask your provider about manufacturer savings programs, compounding options while they remain available, or whether a different covered medication might work for your situation.